--- Begin Message ---
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Subject: |
25.0.50; Incorrect line height for some fonts |
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Date: |
Thu, 21 May 2015 23:02:06 -0400 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 |
Hi,
Some Unicode characters incorrectly increase the height of the line on which
they are inserted, by an incorrect amount (typically 4/5 times the normal line
height). This is due to Emacs falling back to a font for which line height
calculations are incorrect. The problem can generally be reproduced just by
inputing the following characters:
(𝓝𝓟)
Alternatively, the problem can be reproduced by switching to certain
specific fonts. For example:
(set-frame-font "-unknown-Latin Modern
Math-normal-normal-normal-*-*-*-*-*-*-0-iso10646-1" nil nil)
This problem is not specific to 25.0.50. It is discussed on stackexchange [1]
and the effect can be observed in [2]. It only occurs with specific fonts. It
particularly impacts packages that rely on prettify-symbols-mode to display math
symbols; when users install the package, some lines in the buffer start being 4
or 5 times taller than other lines, although no characters on the affected lines
stand out. For this reason, even if this is likely a problem in the way the
fonts are packaged, it would be nice to have a workaround at the Emacs level.
Emacs is the only program on my system that displays this behaviour; typing the
same text in gedit or switching gedit to one of the misbehaving fonts, for
example, does not affect the line height.
[1] http://emacs.stackexchange.com/questions/251/
[2]
https://cloud.githubusercontent.com/assets/2506825/7760973/67ceaaea-ffd5-11e4-8bf6-d796aa162b0e.png
---
In GNU Emacs 25.0.50.4 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
of 2015-05-14 on c-mint
Windowing system distributor `The X.Org Foundation', version 11.0.11501000
System Description: Linux Mint 17.1 Rebecca
Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
Important settings:
value of $LC_TIME: en_DK.UTF-8
value of $LANG: en_US.UTF-8
value of $XMODIFIERS: @im=ibus
locale-coding-system: utf-8-unix
Major mode: Lisp Interaction
Minor modes in effect:
tooltip-mode: t
global-eldoc-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
tool-bar-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
blink-cursor-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
line-number-mode: t
Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Load-path shadows:
None found.
Features:
(shadow sort gnus-util mail-extr emacsbug message dired format-spec
rfc822 mml easymenu mml-sec mm-decode mm-bodies mm-encode mail-parse
rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045
ietf-drums mm-util help-fns mail-prsvr mail-utils mule-util time-date
tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel x-win term/common-win x-dnd tool-bar dnd fontset image regexp-opt
fringe tabulated-list newcomment elisp-mode lisp-mode prog-mode register
page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock
font-lock syntax facemenu font-core frame cl-generic cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
minibuffer cl-preloaded nadvice loaddefs button faces cus-face macroexp
files text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote dbusbind gfilenotify
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty make-network-process emacs)
Memory information:
((conses 16 76472 5652)
(symbols 48 18496 0)
(miscs 40 87 99)
(strings 32 11421 4141)
(string-bytes 1 314062)
(vectors 16 9839)
(vector-slots 8 396279 11643)
(floats 8 102 46)
(intervals 56 177 0)
(buffers 976 11)
(heap 1024 40850 1039))
--- End Message ---
--- Begin Message ---
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Subject: |
Re: bug#20628: 25.0.50; Incorrect line height for some fonts |
|
Date: |
Sat, 06 Jun 2015 16:14:41 +0300 |
> Date: Mon, 01 Jun 2015 17:49:17 +0300
> From: Eli Zaretskii <address@hidden>
> Cc: address@hidden, address@hidden
>
> > From: Oleh Krehel <address@hidden>
> > Cc: address@hidden, address@hidden
> > Date: Mon, 01 Jun 2015 12:54:28 +0200
> >
> > Eli Zaretskii <address@hidden> writes:
> >
> > > I couldn't actually reproduce such crashes on my system, but I made a
> > > few changes that hopefully will prevent them. Could you please see if
> > > the latest branch tip still crashes under some circumstances?
> >
> > Thanks, the crash no longer occurs with your latest change.
>
> Great!
>
> I will wait a few more days, in the hope that more people could check
> out the branch and provide feedback, and will merge it then, barring
> any new problems.
The changes are now merged with master.
I'm marking this bug "done".
Thanks again to everyone for their help.
--- End Message ---